When comparing California vs Calendar, the Slant community recommends Calendar for most people. In the question“What are the best calendar apps for Linux?”Calendar is ranked 3rd while California is ranked 10th.

Pros

Pro

Integrates with the desktop in order to provide notifications

California offers desktop notification on most major DEs in Linux, which is great to know when events are happening while not having to have the app open in the foreground.

Pro

Events can be added using natural language

The application allows natural language input for events. For example, typing in "Lunch with Stuart Kearney at 2 pm" will set the appointment.

Pro

GNOME Native integration

Pro

Synchronisation

It has online accounts integration.

Pro

Currently in active development

GNOME Calendar is improved with every release cycle of GNOME.

Pro

Simplicity

Calendar for GNOME aims to find the perfect balance between features and usability.

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Cons

Con

Currently not in active development

Yorba, the group that developed California, is no longer actively developing software.While Geary (Yorba's mail client) has been adopted by the elementary teams as "Pantheon Mail", both elementary and Gnome have their own calendar projects and it is unlikely that either of them will contribute to California in the future.That being said, California uses evolution data server for all backend/sync/storage related tasks, which should hopefully make it possible to use it even if 3rd party vendors change their APIs/protocols etc. As long as EDS does not introduce backward incompatible changes or any major California bugs occur (it has been working fine for me so far), the current state of California should remain usable for quite a while.

Con

Currently no drag and drop support

There is no way to drag events in the app for easy switching, it all has to be done manually which can be a lot of work to move many things around.

Con

No support yet for WebCal

No support yet for WebCal, such as those offered by Facebook events.

A workaround exists. Since this application uses the same background services as Evolution, installing it and adding the WebCal calendars there, also adds them to GNOME Calendar.

Con

Only works on GNOME

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